Wallbox shows E15; LEDs may indicate fault; charger does not respond to plug-in.

Safety first: Internal power supply faults can involve hazardous voltages. Only qualified personnel should open and test the unit.

• Check external power: Confirm that the upstream breaker is ON and that correct mains voltage is present at the wallbox input terminals.
• Observe LEDs: If no LEDs or display are active despite correct input voltage, the internal power supply is likely faulty.
• Internal fuse check: With power off, a technician can inspect any internal fuses on the control board or power supply module and replace them with identical rated parts if blown. A blown fuse often indicates another underlying fault.
• Module/board replacement: If the internal supply does not start after fuse replacement, the power supply section or entire control board must be replaced.